A good power supply is the foundation for great sound. The high-quality components of the FiiO PL50 power supply ensure higher efficiency, more precision, a more stable voltage, and greater power output compared to using a standard power adapter. With FiiO's premium linear power supply, background noise is reduced, transients and dynamics are refined, and you will experience a more precise, warmer sound down to the lowest frequencies. To accommodate various audio devices, the PL50 supports both 12-volt and 15-volt power requirements. Treat your digital-to-analog converter or headphone amplifier to an upgrade. The FiiO PL50 power supply will elevate the sound of your FiiO device to a new level. Included in the package is a power cable to connect the PL50 to the wall outlet, as well as a cable to connect the FiiO PL50 to various audio devices. This features a 5.5 x 2.1 mm connector, compatible with FiiO K5 Pro ESS, K7, Q7, R7, M17, K19, K11, K11 R2R, K7, K7 BT, R9, R7, and various devices from other brands.